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abutment alignment Andhra Pradesh appears Assistant Geologists associated bands Bihar boreholes Calcutta carried cent Central Circle clay coal coal seams coalfield collected comprise consist construction containing continued copper covered deposits depth detailed developed dips district Ditto Division dolomite drilling dykes east Engineer examined exposed fault five folded foliation formations foundation geological Geologists Geophysical gneiss grade granite groundwater Gupta Headquarters hill holes in-Charge India indicated joints Laboratories laterite lignite limestone located Long Lower Madras mapped Scale metres mineral mineralisation occur Office pegmatite period phyllite places Pradesh prepared Project proposed publications quartz quartzite Rajasthan recommended recorded Regional Office reported reserves river rock types samples sand sandstone Sarvashri schist seams shale sheets Shri Srivastava strike studies suggested suitable supply Survey thick tion tonnes trend tunnel University Upper varying veins zone